/Engine/Source/Editor/Sequencer/Public/ISequencer.h
Create a widget containing the spinboxes for setting the working and playback range
the widget
[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > MakeTimeRange ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & InnerContent, bool bShowWorkingRange, bool bShowViewRange, bool bShowPlaybackRange )